Table 2.
Distribution of cohorts and proportion of samples positive for Salmonella spp. by the Salmonella status of nursery and environmental swabs*
| Nursery and environment status | No. of positive cohorts | No. of negative cohorts | Positive faecal samples tested (n/N) | Proportion of positive faecal samples (%)† | 95% CI |
|---|---|---|---|---|---|
| Nursery+ environment+ | 9 | 1 | 383/3771 | 10·2a | 9·2–11·2 |
| Nursery+ environment– | 3 | 0 | 38/1150 | 3·3bd | 2·4–4·5 |
| Nursery− environment+ | 1 | 0 | 2/362 | 0·6ce | 0–2·0 |
| Nursery− environment– | 3 | 0 | 23/1163 | 2de | 1·3–3·0 |
CI, Confidence interval.
*
Seventeen cohorts are represented, one cohort was excluded as no nursery samples were collected.
†
Different superscript letters indicate a significant difference (P < 0·05) of proportion of positive faecal samples.